https://www.nasa.gov/feature/jpl/results-of-heat-shield-testing https://www.nasa.gov/feature/jpl/results-of-heat-shield-test... "The structure was originally t

https://www.nasa.gov/feature/jpl/results-of-heat-shield-testing https://www.nasa.gov/feature/jpl/results-of-heat-shield-test... "The structure was originally tested in 2008 and was one of two heat shields manufactured in support of the Mars Science Laboratory mission, which successfully landed the Curiosity rover on Mars in August 2012." It was a spare from a previous mission. I would expect the risk was Nasa's, and they are only out the cost of testing.